Manta 36 Review: I replaced an aging TNF day pack which was probably state of the art 15 years ago, this pack just blows it away, period. Very smart layout. Don't forget it also includes Osprey's second generation hydration bag, which so far is great. I've been a plain old Platypus bag fan for years now, but this is pretty darn good. Love the off the back suspension system, no more wet back! It's really not too big for a day pack, especially for winter use. The stuff it opening between the main and outer bag is a great feature. My only concern is the stretchy pouch fabric used here and there. Being elastic it WILL wear out someday, probably in less than 15 years I bet.

I had a similar pack, but smaller pack for hike's to Half Dome. I discovered I needed room for food, rain gear, water filter and ample water capacity. This size works great. I almost bought a smaller Osprey 25, but now I'm glad I went bigger. The straps compact my load securely, even if I don't need the extra space. It's good to know it's there if I need it.

I bought this pack before a trip to do a few Colorado 14er's. All I can say, is that it is phenomenal. Osprey thought of everything for the bag. The hydration system is ergonomic, the "Stow and Go" trekking pole storage is genius and seems almost magical in the how little it encumbers you. I recommend no other day-pack in the store this highly.

I think that Osprey hydration units are sooo much better than Camelbak brand. The hydration unit itself has a flat back to it, makes it much easier to load into the pack when the pack is full of gear. Its easy to put water in the unit too, spin the closure and it will actually close and stay sealed. The backpack is well ventilated and comfortible. The coolest feature is how the hose has a magnetic feature that connects to the front strap.

I am currently training for my first 100 mile race that will be taking place in mid-October. I have owned the Manta 25 for just a few days now. but have taken it on a 10 mile run with the bladder full of water, and a useful load in the hip pockets. I have noticed right away that this bag has benefits over my CamelBak Octane 24, namely that it holds its strength and the side winching straps keep the load higher up on my back. The result is that the harnesses don't slip down my back, and the load is held properly.The bladder is SUPER EASY to fill and replace into the bad. Finally the mesh back is really good and provides true air-flow, which is comfort for my back!